1. Parmi les sous-ensembles suivants, lesquels sont des sous-espaces vectoriels de R? U = {(r, y, z) | x – 2y + z = 0} V = {(r, xy, y) | x, y E R} W = {(x, y, 2) | 2x – 5z = 0} X = {(x+ y, Y, x - 2y) | r, y E R} %3D A. Seulement U et V B. Seulement U et W C. Seulement W et X D. Seulement U, V et W E. Seulement U, V et X F. Seulement U, W et X

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